メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.763056338456 43.1898438671019, 141.762266196845 43.1907003284375, 141.761779110388 43.1904608235782, 141.761334166265 43.1902344369346, 141.76131068187 43.1902204816687, 141.762147907383 43.1893724562484, 141.762588528314 43.1895981174565, 141.763056338456 43.1898438671019)) ^^http://www.opengis.net/ont/geosparql#wktLiteral